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Tunable multi-wavelength random distributed feedback fiber laser based on dual-pass MZI
Applied Physics B ( IF 2.1 ) Pub Date : 2021-01-16 , DOI: 10.1007/s00340-020-07548-8
Jingwei Liu , Zhengrong Tong , Weihua Zhang , Xutao Shi , Jiaxin Li

A tunable half-open cavity multi-wavelength erbium-doped random distributed feedback (RDFB) fiber laser is proposed and experimentally demonstrated. The backward Rayleigh scattering generated by inhomogeneous reflective in the 25-km-long single mode fiber is amplified by the 8-m-long pumped erbium-doped fiber (EDF). The dual-pass Mach–Zehnder interferometer (MZI) acts as the reflection mirror in the half-open cavity. Due to the EDF gain and the half-open structure, the laser threshold is suppressed to 40 mW. The number of laser channel increases linearly with the increasing pump power. Under the pump power of 350 mW, there are seven lasing channels in the spectrum. One arm of the MZI is circled on piezoelectric transducer (PZT) and tunable multi-wavelength lasing operation is realized by adjusting the DC voltage on PZT. When the pump power and the driving voltage attached on PZT are 250 mW and 5 V, the wavelengths of six channels are blue-shifted 0.7 nm. The proposed tunable RDFB fiber laser has the advantages of low cost, simple structure and low threshold, which can be widely used in remote sensing and biomedical imaging.

中文翻译:

基于双通MZI的可调谐多波长随机分布反馈光纤激光器

提出并实验证明了一种可调谐半开腔多波长掺铒随机分布反馈 (RDFB) 光纤激光器。在 25 公里长的单模光纤中由非均匀反射产生的后向瑞利散射被 8 米长的泵浦掺铒光纤 (EDF) 放大。双通 Mach-Zehnder 干涉仪 (MZI) 在半开腔中充当反射镜。由于 EDF 增益和半开结构,激光阈值被抑制到 40 mW。激光通道数随着泵浦功率的增加而线性增加。在 350 mW 的泵浦功率下,光谱中有 7 个激光通道。MZI 的一个臂环绕在压电换能器 (PZT) 上,通过调节 PZT 上的直流电压实现可调谐多波长激光操作。当泵浦功率和附加在 PZT 上的驱动电压为 250 mW 和 5 V 时,六个通道的波长蓝移 0.7 nm。所提出的可调谐RDFB光纤激光器具有成本低、结构简单、阈值低等优点,可广泛应用于遥感和生物医学成像。
更新日期:2021-01-16
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